Computer Code: |
ME |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
Lithological Description: |
Psammite; subsidiary pelite, quartzite and semipelite, variably gneissose. |
Definition of Lower Boundary: |
Likely overlying Lewisian Gneiss (L), with sheared unconformity. |
Definition of Upper Boundary: |
Not exposed. |
Thickness: |
Unknown: strongly deformed. |
Geographical Limits: |
Shetland: Yell, Mainland; east of the Walls Boundary Fault. |
Parent Unit: |
Wester Ross Supergroup (WROS)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
Moine Supergroup [Obsolete: use LNES, WROS]
|
Stratotypes: |
none recorded or not applicable |
Reference(s): |
Krabbendam, M. 2021. A stratigraphic framework for the early Neoproterozoic successions of the Northern Highlands of Scotland. UK Stratigraphic Framework Series. British Geological Survey Open Report, OR/21/072. 86pp. |
Flinn, D, 1994. Geology of Yell and some neighbouring islands in Shetland. Memoir of the British Geological Survey, Sheet 130 (Scotland). |
Jahn, I, Strachan, R, Fowler, M, Bruand, E, Kinny, P, Clark, C, and Taylor, R J. 2017. Evidence from U-Pb zircon geochronology for early Neoproterozoic (Tonian) reworking of an Archaean inlier in northeastern Shetland, Scottish Caledonides: Journal of the Geological Society, v. 174, no. 2, p. 217-232. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S129
S127
S128
S130
S131
|